我正在使用StrongSwan在Amazon EC2实例上的Linux实例和通过其Cisco集中器的远程网络之间建立VPN。我需要将来自Linux实例本身的数据包路由到远程子网中的计算机。

建立连接正常，但没有路由任何数据包。

我认为我需要设置一些特定的路由规则，该怎么做呢？

软件

• Linux内核3.5.0-41，
• Ubuntu 12.10，
• strongSwan 5.1.1（从源代码构建），
• iptables-没有规则。

网络

本地

• 亚马逊弹性IP：56.xxx
• 面向公众的LAN IP：172.xxx
• 本地虚拟子网：10.254.0.0/16
• 本地虚拟IP：10.254.5.174

远程

• 思科集中器的公共IP：62.xxx
• 远程子网：10.192.0.0/12

组态

ipsec.conf

config setup

conn %default
    keyexchange = ikev1
    type = tunnel
    ikelifetime = 86400
    keylife = 28800
    keyingtries = %forever
    esp = 3des-sha
    ike = 3des-md5-modp1024
    forceencaps = yes
    leftauth = psk
    rightauth = psk

conn myconnection
    left = 172.x.x.x
    leftsubnet = 10.254.0.0/16
    leftsourceip = 10.254.5.174
    leftfirewall = yes
    right = 62.x.x.x
    rightsubnet = 10.192.0.0/12
    auto = route

include /var/lib/strongswan/ipsec.conf.inc

strongswan.conf

charon {
    cisco_unity             = yes
    install_routes          = yes
    install_virtual_ip      = yes
    threads                 = 16
    plugins {
        sql {
            loglevel = -1
        }
    }

    filelog {
        /var/log/charon.log {
            time_format = %b %e %T
            default = 3
            flush_line = yes
        }
    }
}

pluto {
}

libstrongswan {
}

ipsec statusall

# ipsec statusall
Status of IKE charon daemon (strongSwan 5.1.1, Linux 3.5.0-41-generic, x86_64):
  uptime: 4 days, since Jan 22 14:24:08 2014
  malloc: sbrk 270336, mmap 0, used 222672, free 47664
  worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0, scheduled: 3445
  loaded plugins: charon aes des rc2 sha1 sha2 md5 random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem fips-prf gmp xcbc cmac hmac attr kernel-netlink resolve socket-default stroke updown xauth-generic
Listening IP addresses:
  172.x.x.x
  54.x.x.x
Connections:
    smsbrick:  172.x.x.x...62.x.x.x  IKEv1
    smsbrick:   local:  [172.x.x.x] uses pre-shared key authentication
    smsbrick:   remote: [62.x.x.x] uses pre-shared key authentication
    smsbrick:   child:  10.254.0.0/16 === 10.192.0.0/12 TUNNEL
Routed Connections:
    smsbrick{1}:  ROUTED, TUNNEL
    smsbrick{1}:   10.254.0.0/16 === 10.192.0.0/12 
Security Associations (1 up, 0 connecting):
    smsbrick[8150]: ESTABLISHED 1 second ago,    172.x.x.x[172.x.x.x]...62.x.x.x[62.x.x.x]
    smsbrick[8150]: IKEv1 SPIs: xxxxxxxxxxxxxx_i* xxxxxxxxxxxxx_r, pre-shared key reauthentication in 23 hours
    smsbrick[8150]: IKE proposal: 3DES_CBC/HMAC_MD5_96/PRF_HMAC_MD5/MODP_1024
    smsbrick[8150]: Tasks queued: QUICK_MODE 
    smsbrick[8150]: Tasks active: MODE_CONFIG

ip xfrm

# ip xfrm policy
src 10.192.0.0/12 dst 10.254.0.0/16 
        dir fwd priority 3987 
        tmpl src 62.x.x.x dst 172.x.x.x
                proto esp reqid 1 mode tunnel
src 10.192.0.0/12 dst 10.254.0.0/16 
        dir in priority 3987 
        tmpl src 62.x.x.x dst 172.x.x.x
                proto esp reqid 1 mode tunnel
src 10.254.0.0/16 dst 10.192.0.0/12 
        dir out priority 3987 
        tmpl src 172.x.x.x dst 62.x.x.x
                proto esp reqid 1 mode tunnel
src 0.0.0.0/0 dst 0.0.0.0/0 
        socket in priority 0 
src 0.0.0.0/0 dst 0.0.0.0/0 
        socket out priority 0 
src 0.0.0.0/0 dst 0.0.0.0/0 
        socket in priority 0 
src 0.0.0.0/0 dst 0.0.0.0/0 
        socket out priority 0 
src ::/0 dst ::/0 
        socket in priority 0 
src ::/0 dst ::/0 
        socket out priority 0 
src ::/0 dst ::/0 
        socket in priority 0 
src ::/0 dst ::/0 
        socket out priority 0

很抱歉在该主题上发表文章，对于故障排除而言，在此特定配置上只有一处没有太多信息。

我的配置：

• AWS：Strongswan 5.1.3
• Corp：思科ASA5520 8.4（4）1

症状：

1. 始终可以启动从Cisco ASA专用LAN到AWS专用LAN的隧道和ping操作。

2. 在隧道超时/重新启动时，除非/直到从Cisco ASA端生成流量，否则我无法启动或从AWS ping到Cisco ASA。IPSEC STATUSALL显露

   Tasks active: MODE_CONFIG
   Tasks queued: QUICK_MODE
   

我发现使用modeconfig=push并leftsourceip=同时进行配置时，它被卡在：

Tasks active: MODE_CONFIG
Tasks queued: QUICK_MODE

卸下modeconfig=push时卡在以下位置：

Tasks active: MODE_CONFIG

删除leftsourceip=就可以解决问题，并且一切都稳定起来了。

我认为PIX需要这两个，这可能是ASA的一些旧版本，但不是这个。